Ordnance sight



March 3, 1936.

SR Search R00 .9. c. KARNES 2,632,386

ORDNANCE SIGHT Filed Sept. 6, 1955 2 Sheets$heet l Inventor Jamaz [I -Kar'nes Attnrnay s3. GEOMETRICAL INSTRUMENTS. Search Room a f, 0 A;

Niwch 3, 1936. J. c. KARNES 2,032,366

ORDNANCE SIGHT Filed Sept. 6, 1955 2 Sheets-Sheet 2 E Hg E Inventur Llamas El- Karnes Aili -La t3. GEOMETRICAL \NS l term as.

Patented Mar. 3, 1936 UNITED STATES octii'ml scorn PATENT OFFICE Application September 1 Claim.

6, 1935, Serial No. 39,444

(Granted under the act of March 3, 1883, as

amended April 30,

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to an ordnance sight.

The purpose of this invention is to provide a small compact sight particularly adaptable for mortars and small cannon, and having adjustment in elevation and azimuth.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claim forming a part of this specification.

A practical embodiment of the invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is a view in rear elevation of the improved sight and showing in section its coupling to a mortar.

Fig. 2 is a view in side elevation.

Fig. 3 is a plan View.

Fig. 4 is a sectional view on the line 44 of Fig. 6.

Fig. 5 is a sectional view on the line 5-5 of Fig. 2.

Fig. 6 is a sectional view on the line 66 of Fig. 1.

Fig. 7 is a longitudinal sectional view of a modification.

Referring to Figs. 1 to 6 there is shown the barrel 5 of a mortar having a horizontally projecting support shaft 6. A locking sleeve 1 is mounted on the shaft and is retained against a shoulder 8 by means of a ring 9 which is fastened to the shaft by screws III. The locking ring has an internally threaded sleeve II which is spaced from the support shaft 6.

A sight adapted to be carried by the mortar includes a cylindrical tube l2 (Figs. 5 and 6) which is mounted on the shaft and is connected therewith by a spline [3. The inner end of the tube is externally threaded for engagement by the sleeve II.

A casing 14 rotatably mounted on the outer end of the tube is laterally confined by a fiange l5 on the tube and by a ring l6 secured to the end of the tube by screws I1. A shaft l8 mounted in the casing and having an actuating knob l8 on the exterior thereof includes a worm l9 meshing with worm teeth 20 in the tube l2. A mil scale 2| marked in hundreds of mils is fixed to the ring 16 and is readable against an index 22 on the casing. A knob 23 on one end of the shaft I8 is provided with a mil scale 24 marked from 0 to 99 and readable against an index 25 on the casing. Brackets 26 secured to the opposite sides of the casing carry a spirit level 21 bridging the end of the tube l2.

The casing l4 carries another short cylindrical casing whose axis is perpendicular to that of the casing I 4. This other casing consists of a lower cup part 28 fixed to the casing l4 and an upper part or cover 29 rotatably mounted on the lower part. The upper part has a skirt 30 embracing a portion of the lower part and it also has a central depending portion 3| which is provided with an aperture 32 for receiving a stud 33 of the lower part. A nut 34 on the stud retains the cover in place.

A shaft 35 mounted in the cover 29 and having an actuating knob 35 on the exterior thereof includes a worm 36 meshing with worm teeth 3'! in the lower part 28. A mil scale 38 marked in hundreds of mils is provided on the lower part and is readable against an index 39 on the skirt 30 of the cover. A knob 40 on one end of the shaft 35 is provided with a mil scale 4| marked from O to 99 and is readable against an index 42 on the skirt 30. Brackets 43--43 on the cover carry trunnions 44-44 on which is mounted a collimating sight 45.

In operation the casing I4 is rotated to move the sight in elevation. Azimuth settings are applied by rotating the cover 29 which due to its mounting partakes of the elevation movement.

In the modification shown in Fig. 7 a casing 46 adapted to be mounted on a gun through a tongue and groove connection 41 has at least one end wall 48 and preferably a second end wall 49 rotatable about the casing axis. The end walls are connected to a hub 50 which is rotatably mounted within the casing 46 and is provided with worm teeth 5|. A shaft 52 carried by the casing 46 has a worm 53 meshing with the worm wheel.

A second cylindrical casing having an axis perpendicular to that of the casing 46 has a lower part 54 carried by one or both of the end walls 48 and 49. A cap or cover 55 is rotatably mounted on the lower part 54 and carries a shaft 56 having a worm 51 meshing with worm teeth 58 on the lower part. The cover has a central stem 59 inserted through an aperture 60 in the lower part and retained by a nut 6|. The cover carries a collimating sight 62 and the end wall 48 carries a spirit level 63.

I claim:-

An ordnance sight including a tube having worm teeth means for mounting sagjube unon a gun barrel or the like with its axis dis'fio sed horizontalli a casing mounted on the tube for rotation about the axis thereof, a shaft carried by the casing and having a worm meshing with the teeth of the tube for rotating the casing, brackets on the opposite sides of the casing, a spirit level carried by the brackets and bridging theendof tlie'tube, a cup formed on the casing with an axis perpendicular to that of the rotation axis of the casing and having worm teeth, a cover having a central portion depending within the cup, means for connecting the cup and the central portion of the cover, a skirt on the cover embracing the cup, and a shaft carried by the skirt, said shaft having a worm meshing with the teeth on the cup to rotate the cover about the second axis.

JAMES C. KARNES. 

